Adam smirks as he watches Cassie rush to the back to change into something else.
He knows how to rile up chaotic feelings inside people, and that is what he just did to Cassie.
First, he showed interest in her love life by asking her if this friend was a boy or a girl, and when she gave him a panicked answer, he moved on from the topic as if he didn't even talk about it in the very first place.
Why would anyone do that? No follow-up question, no teasing, nothing. Adam didn't react to it at all.
This caused Cassie some panic, and she began blaming herself for slipping, even though Adam hadn't said a word regarding this matter.
It's always better to let people create their own mess and watch it from the outside to have better control over it.
Adam is just having fun right now. He will decide how to progress with Cassie in the future once he has a full understanding of the type of girl she is.